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[tests] replace os.system usage in ui_tests.py

As suggested replace os.system by subprocess.run; see
https://docs.python.org/3.5/library/subprocess.html#replacing-os-system

Change-Id: Idb2f48423e0bd664b1d0618141950f186a5925cd
---
M tests/ui_tests.py
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/ui_tests.py b/tests/ui_tests.py
index 6337eaa..3920567 100644
--- a/tests/ui_tests.py
+++ b/tests/ui_tests.py
@@ -129,7 +129,7 @@
             setattr(pywikibot.ui, key, value)
 
         def cls(self):
-            os.system('cls')
+            subprocess.run('cls', shell=True)
 
     class pywikibotManager(BaseManager):
 
@@ -683,7 +683,9 @@
 
     def testOutputUnicodeText_no_transliterate(self):
         self.sendstdin(
-            "python -c \"import os, pywikibot; os.system('cls'); "
+            'python -c \"'
+            'import subprocess, pywikibot; '
+            "subprocess.run('cls', shell=True); "
             "pywikibot.output('\\n'.join(pywikibot.handleArgs()))\" "
             'Alpha Bετα Гамма دلتا\n')
         lines = []

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